2023.12.26 10:47 "Re: [Tiff] EXIF tag writing fails starting with libtiff 4.5.1?", by Even Rouault

Bob,

There are 2 regression test for writing EXIF IFD: https://gitlab.com/libtiff/libtiff/-/blob/master/test/custom_dir.c and https://gitlab.com/libtiff/libtiff/-/blob/master/test/custom_dir_EXIF_231.c. So it is likely your issue comes from a subtle difference in using the libtiff API compared to those regression tests.

It could help if you bisected which commit changed the behavior

Even

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